I think my transmission is slipping. Last night I was comming home and I punched it and it felt as though the truck was losing power. Sometimes I break traction in the rain when I punch it but the roads were pretty dry. it only seemed to happen the one time so I'm thinking it has something to do with the truck not fully being warmed up. I also heard more than one time (as I kept trying to make it happen while trying to make the tranny slip again) a squeel which sounded like from under the hood on hard shifts. I think the squeel may be the belt slipping but I don't know. Any info from our resident Ford service techs will be appreciated.

The belt has never been changed and the tranny was serviced at 30k
2006 f150 xlt 4x4 5.4 Running Gryphon on lvl 2

I think my transmission is slipping. Last night I was comming home and I punched it and it felt as though the truck was losing power. Sometimes I break traction in the rain when I punch it but the roads were pretty dry. it only seemed to happen the one time so I'm thinking it has something to do with the truck not fully being warmed up. I also heard more than one time (as I kept trying to make it happen while trying to make the tranny slip again) a squeel which sounded like from under the hood on hard shifts. I think the squeel may be the belt slipping but I don't know. Any info from our resident Ford service techs will be appreciated.

The belt has never been changed and the tranny was serviced at 30k
2006 f150 xlt 4x4 5.4 Running Gryphon on lvl 2

a belt chirp at wot is fairly normal,as for the "trans"concern did you have a check eng lamp or the wrench lamp or o/d lamp flashing?

a moments silence for the shelbyx,i hope her new owner enjoys as much.

No I didn't but I think it may have been some ice or something because it hasn't happened again and I could not reproduce it even that night. I post again if it persists. Thanks for the belt info, as the maintanence manual says it only needs to be changed every 100,000kms and I was going to have it replaced.